Lifting-jack



(No Model.)

LE ROY s. STRINGHA'M.

LIFTING JACK.

No. 437,350. Patented sept. so; 1890.

l VUNITED vSSTATES PATENT OFFICE.

LE ROY S. STRINGHAM, OF CHICAGO, ILLINOIS.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 437,350, dated September 30, 1890. Application filed June 30, 1890. Serial No. 357,294. (No model.)

To all whom it may concern,.-

Be it known that I, LE ROY S. STRINGHAM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Lifting-Jacks, of which the following is a specification.

My invention relates particularly to an improvement in the kind of lifting-jacks for use in jacking up vehicles, and which are also known as carriage-jacks.

The objects of my improvement are to provide a construction of such a jack whereby it maybe readily adapted to it under the axles of vehicles of all classes, thus including those having their axles lower and higher with relation to the ground, and to provide a generally improved construction of carriage-jack both as to strength and durability.

In the accompanying drawings, Figure lis a view in side elevation of my device complete, wit-h certain hidden features indicated by dotted lines; Fig. 2, a perspective view of the jack proper without the removable and adjustable top forming a feature of my improvement, and Fig. 3 a similar view of the top.

Generally stated, my improvement involves f a standard supportingavertically-extensible lifting-bar portion controlled by an actuating-lever, as other jacks involve, though these parts in my device are of improved construction, and a top removably adjustable on the upper end of the extensible portion to be used in cases where the jack proper shown in Fig. 2 is too short to increase the reach thereof and to be removed for the use of the jack where its reach is sufficient without the top.

A is a wooden standard firmly mounted upon a iiat base A.

Bis the vertically-sliding lifting-bar, shown as a frame to t over the standard A and comprising two uprights t t and an inclined top s, all of which may be in one piece and provided vwith two cross cleats or plates r r on opposite sides of its lower end and two cross-plates q p on opposite sides near the upper end. The inclined top s is formed with steps s', and the upper edges of the plates q p, which incline at the same angle as the top, are a short distance below the latter, as shown. Secured to the top .s to extend around one of the lowery is a lever C, carrying at the end of its short arm a roller m, which engages the lower edge of the cross-piece n. All the parts which are iixed together are secured by bolts to give the greatest degree of strength to the device.

As far as described the device is applicable for raising vehicles having their axles at the more usual heights and which would come within the limits of the upper and lowermost steps s', and in operation the device is placed so that the highest step capable of being passed under the axle is in that position. The long arm of the lever C is then swung down to cause the roller m to bear against the edge n and raise the frame until the roller reaches the recess n2, in which it lodges, thus locking the frame in its raised position.

In cases where the axle of the vehicle to be raised is too high to be engaged by the uppermost step of the part B the supplemental top D may be employed. The top D is formed of a block provided on its upper edge with steps Z, being squared off on its lower edge at one end to correspond with the upper step s of the part B, and inclines thence downward to conform to the corners of the lower steps s', upon which it may rest when in position. Projecting downward from bot-h sides of the block are angular and inclined plates k, and at the back of the block and bolted uponlthe outer sides of the plates lo to project below the latter is a stirrup 7c. D in position 'the lower corners of the plates la are inserted into the sockets o and the stirrup k caused to embrace the upper corners of the plates p q. Thus the lower edges of the plates 7o rest upon the upper edges of the plates p q, andthe block is held firmly against slipping.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a lifting-jack, the combination of the In placing the top IOO standard A,having a base A', a lifting-bar B, formed With steps s and fitting the standard to slide thereon, a cross-piece n upon the frame, having a recess n2 in its loWer edge, and a lever C, fulcrumed upon the standard and provided with a roller m to bear against the edge n and enter the recess n2, substantially as and for the purpose set forth.

2. In a lifting-jack, the combination of the standard A, liftingbar B upon the standard, having steps s', a lever C, for actuating the lifting-bar, and a removable top D, having steps Z and fitting and seated upon the upper y end of the lifting-bar and forming a longitudinal extension thereof, substantially as and for the purpose set t'orth.

3. A lifting-jack comprising vin combination a standard A, a vertically-sliding frame B upon the standard, having steps s,a lever C, for actuating the frame, plates q p, having inclined upper edges, and a stirrup 0, affording sockets o on the frame, and a removable top D upon the frame, provided with steps l, downward-projectinginclined plates la to rest upon the plates q p and enter the sockets o', and a stirrup is to embrace the upper end of the frame, substantially as and Jfor the purp pose set forth.

LE ROY S. STRINGHAM. In presence of J. W. DYRENFORTH, M. J. FROST. 

